OpenFeature Gleam SDK

An SDK for the OpenFeature specification.

gleam add openfeature

import gleam/bool
import gleam/dict
import gleam/dynamic
import gleam/io
import gleam/option.{None}
import openfeature/api as openfeature
import openfeature/client
import openfeature/evaluation.{type ResolutionDetails}
import openfeature/evaluation_context
import openfeature/providers/in_memory

pub fn main() {
  let test_flag =
    in_memory.InMemoryFlag(
      "off",
      dict.from_list([
        #("off", dynamic.from(False)),
        #("on", dynamic.from(True)),
      ]),
      None,
    )
  let flags = dict.from_list([#("test_flag", test_flag)])
  let provider = in_memory.provider(flags)
  let _ = openfeature.set_provider(provider)
  // set global provider

  io.println(
    "`test_flag` evaluated to " <> bool.to_string(evaluate_flag("test_flag")),
  )
}

fn evaluate_flag(flag: String) -> Bool {
  openfeature.get_client()
  |> client.resolve_bool_evaluation(flag, False, evaluation_context.empty())
  |> fn(details: ResolutionDetails(Bool)) { details.value }
}

Further documentation can be found at https://hexdocs.pm/openfeature.

🌟 Features

Status	Features	Description
✅	Providers	Integrate with a commercial, open source, or in-house feature management tool.
✅	Targeting	Contextually-aware flag evaluation using evaluation context.
❌	Hooks	Add functionality to various stages of the flag evaluation life-cycle.
❌	Logging	Integrate with popular logging packages.
✅	Domains	Logically bind clients with providers.
❌	Eventing	React to state changes in the provider or flag management system.
⚠️	Shutdown	Gracefully clean up a provider during application shutdown.
⚠️	Extending	Extend OpenFeature with custom providers and hooks.

_{Implemented: ✅ | In-progress: ⚠️ | Not implemented yet: ❌}

Providers

TODO

Targeting

TODO

Hooks

TODO

Logging

TODO

Domains

TODO

Eventing

TODO

Shutdown

TODO

Extending

Develop a provider

TODO

Develop a hook

TODO